Bill Clinton testified under oath in 1998 that he had a sexual affair with Flowers.

Trump was responding to billionaire Mark Cuban, a Hillary Clinton supporter who frequently slams Trump. Cuban on Thursday said he accepted an invitation from Clinton to sit in the front row at Monday’s presidential debate.

Trump’s public reference to Bill Clinton’s extramarital affairs will likely roil the presidential race just two days before the first debate.

Trump said earlier this week that he did not plan to bring up the Clintons’ marriage at the debate.

“I don’t think I’m looking to do that Bill. I don’t know what I’m going to do that exactly,” Trump said during an interview on “The O’Reilly Factor.” “It depends on what level she hits you with, if she’s fair, if it’s unfair, but certainly I’m not looking to do that.”